Welding helmet



FIG. 1 is a front elevational view of a welding helmet showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a bottom plan view thereof; and

FIG. 5 is a top plan view thereof.

The headband shown in broken lines in FIGS. 3, 4 and 5 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a welding helmet, as shown and described. 